Touch display device

ABSTRACT

A touch display device exhibiting low reflectivity is disclosed. The touch display device includes a light-blocking stack composed of at least two light-blocking color layers overlapping a plurality of touch electrodes disposed on an encapsulation unit, and a low-reflection layer disposed on the light-blocking stack, thereby absorbing external light without a separate polarizing plate, thus exhibiting low reflectivity.

CROSS-REFERENCE TO RELATED APPLICATION

This application is a continuation of U.S. application Ser. No.16/924,017, filed on Jul. 8, 2020 which claims the benefit of KoreanPatent Application No 10-2019-0160326, filed on Dec. 5, 2019, which ishereby incorporated by reference as if fully set forth herein.

BACKGROUND Technical Field

The present disclosure relates to a touch display device, and moreparticularly to a touch display device exhibiting low reflectivity.

Description of the Related Art

A touch screen is an input device through which a user may input acommand by selecting instructions displayed on a screen of a displaydevice using a hand or an object. That is, a touch screen converts acontact position that directly contacts a human hand or an object intoan electrical signal and receives selected instructions based on thecontact position as an input signal. Such a touch screen may substitutefor a separate input device that is connected to a display device andoperated, such as a keyboard or a mouse, and thus the range ofapplication of the touch screen is continually increasing.

A touch screen includes a plurality of touch electrodes formed of anopaque material. A polarizing plate is disposed on the touch screen inorder to prevent deterioration in visibility due to reflection of lightincident from outside by the touch electrodes formed of the opaquematerial. However, the polarizing plate incurs an increase in thethickness of a product, an increase in manufacturing costs, and adecrease in transmissivity.

BRIEF SUMMARY

Accordingly, in some embodiments of the present disclosure, a touchdisplay device that substantially obviates one or more problems due tolimitations and disadvantages of the related art is provided.

The present disclosure provides a touch display device exhibiting lowreflectivity.

Additional advantages, technical benefits, and features of thedisclosure will be set forth in part in the description which followsand in part will become apparent to those having ordinary skill in theart upon examination of the following or may be learned from practice ofthe disclosure. The benefits and other advantages of the disclosure maybe realized and attained by the structure particularly pointed out inthe written description and claims hereof as well as the appendeddrawings.

To achieve these benefits and other advantages and in accordance withthe purpose of the disclosure, as embodied and broadly described herein,a touch display device includes a light-blocking stack composed of atleast two light-blocking color layers overlapping a plurality of touchelectrodes disposed on an encapsulation unit, and a low-reflection layerdisposed on the light-blocking stack, thereby absorbing external lightwithout a separate polarizing plate, thus exhibiting low reflectivity.

It is to be understood that both the foregoing general description andthe following detailed description of the present disclosure areexamples and explanatory and are intended to provide further explanationof the disclosure as claimed.

BRIEF DESCRIPTION OF THE DRAWINGS

The accompanying drawings, which are included to provide a furtherunderstanding of the disclosure and are incorporated in and constitute apart of this application, illustrate embodiment(s) of the disclosure andtogether with the description serve to explain the principle of thedisclosure. In the drawings:

FIG. 1 is a perspective view showing a touch display device according tothe present disclosure;

FIG. 2 is a plan view showing a touch display device according to afirst embodiment of the present disclosure;

FIG. 3 is an enlarged plan view of region A in FIG. 2;

FIG. 4 is a cross-sectional view of the touch display device taken alongline I-I′ in FIG. 2;

FIG. 5 is a cross-sectional view showing another embodiment of thelight-blocking stack shown in FIG. 4;

FIG. 6 is a plan view showing the low-reflection layer shown in FIGS. 4and 5;

FIG. 7 is a cross-sectional view showing the relationships between theline widths of the light-blocking stack and the low-reflection layeraccording to the present disclosure and the line width of a polarizingplate according to a comparative example; and

FIG. 8 is a cross-sectional view showing a touch display deviceaccording to a second embodiment of the present disclosure.

DETAILED DESCRIPTION

Reference will now be made in detail to the one or more embodiments ofthe present disclosure, examples of which are illustrated in theaccompanying drawings.

FIG. 1 is a perspective view of a touch display device according to thepresent disclosure.

A touch display device shown in FIG. 1 senses the presence or absence ofa touch and a touch position by sensing a variation in mutualcapacitance Cm (e.g., a touch sensor) in response to a user touchthrough touch electrodes 152 e and 154 e shown in FIG. 2 for a touchperiod. An organic light-emitting display device having the touch sensorshown in FIG. 1 displays an image through a unit pixel UP (refer to FIG.3) including a light-emitting element 120.

To this end, the touch display device includes a unit pixel UP composedof a plurality of subpixels SP arranged in a matrix form on a substrate111, an encapsulation unit 140 disposed on the plurality of subpixelsSP, and a touch sensor Cm disposed on the encapsulation unit 140.

The unit pixel UP is composed of red (R), green (G) and blue (B)subpixels SP, which are arranged in a row. Alternatively, as shown inFIG. 1, the unit pixel UP is composed of red (R), green (G), blue (B)and white (W) subpixels SP. Alternatively, as shown in FIG. 3, the unitpixel UP is formed in a Pentile structure including one red subpixel,one blue subpixel, and two green subpixels.

Each of the subpixels SP includes a pixel-driving circuit and alight-emitting element 120 connected to the pixel-driving circuit.

The pixel-driving circuit includes a switching transistor T1, a drivingtransistor T2, and a storage capacitor Cst. In the present disclosure, astructure in which the pixel-driving circuit includes two transistors Tand one capacitor C is described by way of example, but the presentdisclosure is not limited thereto. That is, a pixel-driving circuithaving a 3T1C structure or 3T2C structure in which three or moretransistors T and one or more capacitors C are provided may be used.

The switching transistor T1 is turned on when a scan pulse is suppliedto a scan line SL, and supplies a data signal supplied to a data line DLto the storage capacitor Cst and a gate electrode of the drivingtransistor T2.

The driving transistor T2 controls the current I supplied from ahigh-voltage (VDD) supply line to the light-emitting element 120 inresponse to the data signal supplied to the gate electrode of thedriving transistor T2, thereby adjusting the amount of light emittedfrom the light-emitting element 120. Even when the switching transistorT1 is turned off, the driving transistor T2 maintains the emission oflight by the light-emitting element 120 by supplying a constant amountof current thereto using the voltage charged in the storage capacitorCst until the data signal of the next frame is supplied.

The driving thin-film transistor T2 130, as shown in FIG. 4, includes asemiconductor layer 134 disposed on a buffer layer 112, a gate electrode132 overlapping the semiconductor layer 134 with a gate insulating film102 interposed therebetween, and source and drain electrodes 136 and 138formed on an interlayer insulating film 114 so as to be in contact withthe semiconductor layer 134. The semiconductor layer 134 is formed of atleast one of an amorphous semiconductor material, a polycrystallinesemiconductor material, or an oxide semiconductor material.

The light-emitting element 120 includes an anode 122, a light-emittingstack 124 formed on the anode 122, and a cathode 126 formed on thelight-emitting stack 124.

The anode 122 is electrically connected to the drain electrode 138 ofthe driving thin-film transistor T2 (130), which is exposed through apixel contact hole that penetrates a pixel planarization layer 118.

At least one light-emitting stack 124 is formed on the anode 122 in anemission area that is defined by a bank 128. The at least onelight-emitting stack 124 is formed by stacking a hole-related layer, anorganic emission layer, and an electron-related layer on the anode 122in that order or in the reverse order. In addition, the light-emittingstack 124 may include first and second light-emitting stacks, which faceeach other with a charge generation layer interposed therebetween. Inthis case, the organic emission layer of any one of the first and secondlight-emitting stacks generates blue light, and the organic emissionlayer of the other one of the first and second light-emitting stacksgenerates yellow-green light, whereby white light is generated throughthe first and second light-emitting stacks. Since the white lightgenerated in the light-emitting stack 124 is incident on a color filterlocated above the light-emitting stack 124, a color image may berealized. Alternatively, colored light corresponding to each subpixelmay be generated in each light-emitting stack 124 without a separatecolor filter in order to realize a color image. That is, thelight-emitting stack 124 of the red (R) subpixel may generate red light,the light-emitting stack 124 of the green (G) subpixel may generategreen light, and the light-emitting stack 124 of the blue (B) subpixelmay generate blue light.

The cathode 126 is formed so as to face the anode 122, with thelight-emitting stack 124 interposed therebetween. The cathode 126 isconnected to a low-voltage (VSS) supply line.

The encapsulation unit 140 prevents foreign materials including but notlimited to external moisture or oxygen from entering the light-emittingelement 120, which is vulnerable to external moisture or oxygen. To thisend, the encapsulation unit 140 includes a plurality of inorganicencapsulation layers 142 and 146 and an organic encapsulation layer 144disposed between the plurality of inorganic encapsulation layers 142 and146. The inorganic encapsulation layer 146 is disposed at the top of theencapsulation unit 140. In this case, the encapsulation unit 140includes at least two inorganic encapsulation layers 142 and 146 and atleast one organic encapsulation layer 144. In the present disclosure,the structure of the encapsulation unit 140 in which the organicencapsulation layer 144 is disposed between the first and secondinorganic encapsulation layers 142 and 146 will be described by way ofexample.

The first inorganic encapsulation layer 142 is formed on the substrate111, on which the cathode 126 has been formed, at the position that isthe closest to the light-emitting element 120. The first inorganicencapsulation layer 142 is formed of an inorganic insulating materialthat is capable of being deposited at a low temperature, such as siliconnitride (SiN_(x)), silicon oxide (SiO_(x)), silicon oxynitride (SiON),or aluminum oxide (Al₂O₃). Thus, since the first inorganic encapsulationlayer 142 is deposited in a low-temperature atmosphere, it is possibleto prevent damage to the light-emitting stack 124, which is vulnerableto a high-temperature atmosphere, during the process of depositing thefirst inorganic encapsulation layer 142.

The organic encapsulation layer 144 serves to dampen the stress betweenthe respective layers due to bending of the organic light-emittingdisplay device and to increase planarization performance. The organicencapsulation layer 144 is formed of an organic insulating material,such as acrylic resin, epoxy resin, polyimide, polyethylene, or siliconoxycarbide (SiOC).

When the organic encapsulation layer 144 is formed through an inkjetmethod, at least one dam 106 is disposed in order to prevent the organicencapsulation layer 144, which is in a liquid state, from spreading toan edge of the substrate 111. The at least one dam 106 may prevent theorganic encapsulation layer 144 from spreading to a pad area formed atthe outermost portion of the substrate 111, in which a touch pad 170 anda display pad 104 are disposed. To this end, the at least one dam 106may be formed so as to completely surround the active area, in which thelight-emitting element 120 is disposed, as shown in FIG. 2, or may beformed only between the active area and the pad area. When the pad area,in which the touch pad 170 and the display pad 104 are disposed, isdisposed at one side of the substrate 111, the at least one dam 106 isdisposed only on the one side of the substrate 111. When the pad area,in which the touch pad 170 and the display pad 104 are disposed, isdisposed at opposite sides of the substrate 111, the at least one dam106 is disposed on the opposite sides of the substrate 111. The at leastone dam 106 is formed in a single-layered or multi-layered structure.The at least one dam 106 is formed simultaneously with at least one ofthe pixel planarization layer 118, the bank 128, or the spacer using thesame or substantially the same material.

The second inorganic encapsulation layer 146 is formed on the substrate111, on which the organic encapsulation layer 144 has been formed, so asto cover the top and side surfaces of each of the organic encapsulationlayer 144 and the first inorganic encapsulation layer 142. Accordingly,the second inorganic encapsulation layer 146 reduces or preventspermeation of external moisture or oxygen into the first inorganicencapsulation layer 142 and the organic encapsulation layer 144. Thesecond inorganic encapsulation layer 146 is formed of an inorganicinsulating material, such as silicon nitride (SiN_(x)), silicon oxide(SiO_(x)), silicon oxynitride (SiON), or aluminum oxide (Al₂O₃).

A touch sensor Cm is disposed on the encapsulation unit 140. The touchsensor Cm includes a touch insulating film 156, and further includes atouch-sensing line 154 and a touch-driving line 152 disposed so as tointersect each other, with the touch insulating film 156 interposedtherebetween. The touch sensor charges an electric charge using atouch-driving pulse supplied to the touch-driving line 152, anddischarges the electric charge to the touch-sensing line 154.

The touch-driving line 152 includes a plurality of first touchelectrodes 152 e and first bridges 152 b electrically connecting thefirst touch electrodes 152 e to each other.

The first touch electrodes 152 e are spaced apart from each other atregular intervals in an X direction, which is a first direction, on thetouch insulating film 156. Each of the first touch electrodes 152 e iselectrically connected to a neighboring first touch electrode 152 e viathe first bridge 152 b.

The first bridge 152 b is disposed on the touch insulating film 156,which is coplanar with the second touch electrode 154 e, and thus iselectrically connected to the second touch electrode 154 e without aseparate contact hole.

The touch-sensing line 154 includes a plurality of second touchelectrodes 154 e and second bridges 154 b electrically connecting thesecond touch electrodes 154 e to each other.

The second touch electrodes 154 e are spaced apart from each other atregular intervals in a Y direction, which is a second direction, on thetouch insulating film 156. Each of the second touch electrodes 154 e iselectrically connected to a neighboring second touch electrode 154 e viathe second bridge 154 b.

The second bridge 154 b is formed on a touch buffer film 148, which isformed of an insulating material. The second bridge 154 b is exposedthrough a touch contact hole 158 that penetrates the touch insulatingfilm 156, and is electrically connected to the first touch electrode 152e.

As shown in FIG. 3, the first and second touch electrodes 152 e and 154e and the first bridge 152 b are formed in a mesh type such that they donot overlap the emission area of each subpixel SP and overlap the bank128. The second bridge 154 b is formed in a V shape or an inverse Vshape so as to avoid overlapping the emission area of each subpixel SPbut to overlap the bank 128. Accordingly, it is possible to prevent anaperture ratio and transmissivity from being deteriorated by the firstand second touch electrodes 152 e and 154 e and the first and secondbridges 152 b and 154 b.

The first and second touch electrodes 152 e and 154 e and the first andsecond bridges 152 b and 154 b have higher conductivity than atransparent conductive film, and thus are formed as low-resistanceelectrodes. The first and second touch electrodes 152 e and 154 e andthe first and second bridges 152 b and 154 b are formed in asingle-layered or multi-layered structure together with routing lines160 using a touch metal layer formed of a material having high corrosionresistance and acid resistance and excellent conductivity, such as Ta,Ti, Cu, or Mo. For example, the first and second touch electrodes 152 eand 154 e, the first and second bridges 152 b and 154 b, and the routinglines 160 are formed in a three-layered structure such as a stack ofTi/Al/Ti, MoTi/Cu/MoTi, or Ti/Al/Mo. Accordingly, the resistances andcapacitances of the first and second touch electrodes 152 e and 154 e,the first and second bridges 152 b and 154 b, and the routing lines 160are reduced. As a result, RC delay is reduced, thus improving touchsensitivity.

According to the present disclosure, each of the touch-driving line 152and the touch-sensing line 154 is connected to a touch-driving unit (notshown) via the routing line 160 and the touch pad 170.

The touch pad 170 is connected to a signal transmission film (notshown), on which the touch-driving unit is mounted. The touch pad 170 iscomposed of first and second touch pad electrodes 172 and 174.

The first touch pad electrode 172 is disposed on at least one of thesubstrate 111, the buffer layer 112, or the interlayer insulating film114, which is disposed below the encapsulation unit 140. The first touchpad electrode 172 is formed of the same or substantially the samematerial as at least one of a gate electrode 132, a source electrode136, or a drain electrode 138 of a driving transistor T2 (130) in thesame plane, and has a single-layered or multi-layered structure. Forexample, since the first touch pad electrode 172 is formed of the sameor substantially the same material as the source and drain electrodes136 and 138 and is disposed on the interlayer insulating film 114, thefirst pad electrode 172 is formed through the same mask process as thesource and drain electrodes 136 and 138.

The second touch pad electrode 174 is electrically connected to thefirst touch pad electrode 172, which is exposed through a pad contacthole 176 that penetrates a pixel protective film 108, the touch bufferfilm 148, and the touch insulating film 156. Since the second touch padelectrode 174 is formed through the same mask process as the routingline 160, the second touch pad electrode 174 is formed of the same orsubstantially the same material as the routing line 160 in the sameplane.

The second touch pad electrode 174 extends from the routing line 160,and is connected to a signal transmission film (not shown), on which thetouch-driving unit is mounted, via an anisotropic conductive film (notshown).

A display pad 104 is also disposed in a non-active area (a bezel), inwhich the touch pad 170 is disposed. For example, as shown in FIG. 2,display pads 104 may be disposed between touch pads 170, or the touchpads 170 may be disposed between the display pads 178. Alternatively,the touch pad 170 may be disposed at one side of the display panel, andthe display pad 104 may be disposed at the opposite side of the displaypanel. However, the arrangement of the touch pad 170 and the display pad104 is not limited to the structure shown in FIG. 2, and may bevariously changed depending on the design requirements of the displaydevice.

The display pad 104 is formed in a stack structure different from thatof the touch pad 170, or is formed in the same stack structure as thetouch pad 170, as shown in FIG. 3.

The routing line 160 transmits a touch-driving pulse generated in thetouch-driving unit to the touch-driving line 152 through the touch pad170, and transmits a touch signal from the touch-sensing line 154 to thetouch-driving unit through the touch pad 170. Accordingly, the routingline 160 is formed between each of the first and second touch electrodes152 e and 154 e and the touch pad 170 to electrically connect each ofthe first and second touch electrodes 152 e and 154 e to the touch pad170. As shown in FIG. 2, the routing line 160 extends from the firsttouch electrode 152 e to at least one of the left side or the right sideof the active area AA, and is connected to the touch pad 170. Inaddition, the routing line 160 extends from the second touch electrode154 e to at least one of the upper side or the lower side of the activearea, and is connected to the touch pad 170. This arrangement of therouting line 160 may be variously changed depending on the designrequirements of the display device. The routing line 160 is disposedabove first and second dams 162 and 164 so as to overlap with the firstand second dams 162 and 164.

A color filter array is disposed so as to cover the routing lines 160,the touch electrodes 152 e and 154 e, and the bridges 152 b and 154 b.

The color filter array includes a touch planarization layer 190, a colorfilter 192, a light-blocking stack 194, a low-reflection layer 196, anda touch protective film 198.

The touch planarization layer 190 is formed of an organic insulatingmaterial, and flattens the substrate 111, on which the routing lines160, the touch electrodes 152 e and 154 e, and the bridges 152 b and 154b have been formed.

The color filter 192 is disposed so as to overlap the emission areaexposed by the bank 128 of each subpixel area. A red (R) color filter192 is formed on the touch planarization layer 190 of the red subpixelarea, a green (G) color filter 192 is formed on the touch planarizationlayer 190 of the green subpixel area, and a blue (B) color filter 192 isformed on the touch planarization layer 190 of the blue subpixel area.

The light-blocking stack 194 is disposed so as to overlap the bank 128between the color filters 192. The light-blocking stack 194 serves todistinguish between the subpixel areas and to prevent opticalinterference and light leakage between adjacent subpixel areas. Inaddition, the light-blocking stack 194 is formed such that thereflectivity thereof has a single-digit percentage (%). As such, thelight-blocking stack 194 absorbs external light, thereby reducing orminimizing deterioration in visibility and brightness.

The light-blocking stack 194 is formed by stacking at least twolight-blocking color layers 194 a and 194 b that realize differentcolors from each other. That is, the light-blocking stack 194 is formedby stacking first and second light-blocking color layers 194 a and 194b, as shown in FIG. 4, or is formed by stacking first to thirdlight-blocking color layers 194 a, 194 b and 194 c, as shown in FIG. 5.The first light-blocking color layer 194 a is formed of the same orsubstantially the same material as any one of the red (R), green (G),and blue (B) color filters 192. Since the second light-blocking colorlayer 194 b is formed of the same or substantially the same material asthe color filter 192, which realizes a color different from that of thefirst light-blocking color layer 194 a, the second light-blocking colorlayer 194 b absorbs light that has passed through the firstlight-blocking color layer 194 a, among the light generated by thelight-emitting element 120. The third light-blocking color layer 194 cis formed of the same or substantially the same material as the colorfilter 192, which realizes a color different from that of the first andsecond light-blocking color layers 194 a and 194 b. The thirdlight-blocking color layer 194 c absorbs light that has passed throughthe first and second light-blocking color layers 194 a and 194 b, amongthe light generated by the light-emitting element 120.

For example, in the case of the light-blocking stack 194 having thetwo-layered structure shown in FIG. 4, since the first light-blockingcolor layer 194 a is formed of the same or substantially the samematerial as the red (R) or green (G) color filter 192, the firstlight-blocking color layer 194 a is formed through the same mask processas the red (R) or green (G) color filter 192. Since the secondlight-blocking color layer 194 b is formed of the same or substantiallythe same material as the blue (B) color filter 192, the secondlight-blocking color layer 194 b is formed through the same mask processas the blue (B) color filter 192. In the case of the light-blockingstack 194 having the three-layered structure shown in FIG. 5, the firstlight-blocking color layer 194 a is formed through the same mask processas the red (R) color filter 192 using the same or substantially the samematerial as the red (R) color filter 192. The second light-blockingcolor layer 194 b is formed through the same mask process as the green(G) color filter 192 using the same or substantially the same materialas the green (G) color filter 192. The third light-blocking color layer194 c is formed through the same mask process as the blue (B) colorfilter 192 using the same or substantially the same material as the blue(B) color filter 192.

As described above, the light-blocking stack 194 of the presentdisclosure is composed of at least two light-blocking color layers,rather than black resin. In this case, the present disclosure does notuse a chemical solution (e.g., a developer), which is used to patternblack resin. Accordingly, in the present disclosure, the second touchpad electrode 174 and the routing line 160 do not react with a chemicalsolution (a developer), which is used to pattern black resin. Thus, itis possible to prevent corrosion of the second touch pad electrode 174and the routing line 160. Further, the second touch pad electrode 174and the routing line 160 have resistance to corrosion by a chemicalsolution used to pattern the light-blocking stack 194. Thus, it ispossible to prevent the second touch pad electrode 174 and the routingline 160 from being corroded by the chemical solution used to patternthe light-blocking stack 194.

As shown in FIG. 6, the low-reflection layer 196 is formed in the regionother than the region where the color filter 192 of each subpixel SP islocated. That is, since the low-reflection layer 196 is disposed on thelight-blocking stack 194 so as to cover the top and side surfaces of thelight-blocking stack 194, the low-reflection layer 196 overlaps thetouch electrodes 152 e and 154 e and the bridges 152 b and 154 b. Thelow-reflection layer 196 is formed of a low-reflection material havingreflectivity having a single-digit percentage (%). For example, thelow-reflection layer 196 is formed in a single-layered or multi-layeredstructure using at least one of TiO_(x), CuN_(x), CuMg, CuS, AlON,AlTiN, MoTaO_(x), or MoTiON. Since the low-reflection layer 196 absorbsexternal light, it is possible to reduce or minimize deterioration invisibility and brightness.

As shown in FIG. 7, since the low-reflection layer 196 and thelight-blocking stack 194 of the present disclosure are disposed underthe touch protective film 198, the spacing distance from the bank 128 isshorter than the spacing distance between the bank 128 and alight-blocking unit 96 of a conventional polarizing plate disposed onthe touch protective film 198. In this case, even when the line widthsof the low-reflection layer 196 and the light-blocking stack 194 areincreased so as to be larger than that of the light-blocking unit 96 ofthe conventional polarizing plate by 1 to 2 μm, the light generated bythe light-emitting element 120 is emitted without being blocked by thelow-reflection layer 196 or the light-blocking stack 194. Accordingly,the low-reflection layer 196 and the light-blocking stack 194 of thepresent disclosure are capable of being formed to be wider than thelight-blocking unit 96 of the conventional polarizing plate by apredetermined width W, thereby preventing the occurrence of color mixingand a reduction in viewing angle.

The touch protective film 198 is formed on the substrate 111, on whichthe touch sensor, the color filter 192, the light-blocking stack 194,and the low-reflection layer 196 have been formed, so as to expose thedisplay pad 104 and the touch pad 170. The touch protective film 198prevents the touch sensor, the color filter 192, the light-blockingstack 194, and the low-reflection layer 196 from being damaged byexternal shocks or moisture.

FIG. 8 is a cross-sectional view showing a touch display deviceaccording to a second embodiment of the present disclosure.

The touch display device shown in FIG. 8 includes the same components asthe touch display device shown in FIG. 4, except that at least one of alight-blocking stack 194 or a low-reflection layer 196 is disposed on arouting line 160. Thus, a description of the same components will beomitted.

The light-blocking stack 194 is disposed so as to overlap the bank 128between color filters 192. Further, the light-blocking stack 194 isdisposed above the routing line 160 so as to overlap the routing line160. The light-blocking stack 194 serves to distinguish between thesubpixel areas and to prevent optical interference and light leakagebetween adjacent subpixel areas. In addition, the light-blocking stack194 is formed such that the reflectivity thereof has a single-digitpercentage (%). As such, the light-blocking stack 194 absorbs externallight, thereby reducing or minimizing deterioration in visibility andbrightness. The light-blocking stack 194 is formed by stacking at leasttwo light-blocking color layers 194 a and 194 b, which realize differentcolors from each other.

As described above, the light-blocking stack 194 of the presentdisclosure is composed of at least two light-blocking color layers 194 aand 194 b, rather than black resin. In this case, the present disclosuredoes not use a chemical solution (e.g., a developer), which is used topattern black resin. Accordingly, in the present disclosure, the secondtouch pad electrode 174 does not react with a chemical solution (e.g., adeveloper), which is used to pattern black resin. Thus, it is possibleto prevent corrosion of the second touch pad electrode 174.

As shown in FIG. 8, since the low-reflection layer 196 is disposed onthe light-blocking stack 194 so as to cover the top and side surfaces ofthe light-blocking stack 194, the low-reflection layer 196 overlaps therouting line 160, the touch electrodes 152 e and 154 e, and the bridges152 b and 154 b. The low-reflection layer 196 is formed of a low-reflection material having reflectivity having a single-digitpercentage (%). For example, the low-reflection layer 196 is formed in asingle-layered or multi-layered structure using at least one of TiO_(x),CuN_(x), CuMg, CuS, AlON, AlTiN, MoTaO_(x), or MoTiON. Since thelow-reflection layer 196 absorbs external light, it is possible toreduce or minimize deterioration in visibility and brightness.

Although the present disclosure has been described by exemplifying themutual-capacitance-type touch sensor, which includes the touch-sensingline 154 and the touch-driving line 152 intersecting each other, withthe touch insulating film 156 interposed therebetween, the presentdisclosure may also be applied to a self-capacitance-type touch sensor.Since each of a plurality of self-capacitance-type touch electrodes haselectrically independent self-capacitance, it is used as aself-capacitance-type touch sensor, which senses variation incapacitance in response to a user touch. That is, the light-blockingstack 194 and the low-reflection layer 196 are disposed so as to overlapa plurality of self-capacitance-type touch electrodes and the routingline 160. Accordingly, the light-blocking stack 194 and thelow-reflection layer 196 absorb external light, thereby reducing orminimizing deterioration in visibility and brightness.

A touch display device according to various embodiments of the presentdisclosure may be described as follows.

The touch display device according to the present disclosure includes alight-emitting element disposed on a substrate, an encapsulation unitdisposed on the light-emitting element, a plurality of touch electrodesdisposed on the encapsulation unit, a light-blocking stack including atleast two light-blocking color layers overlapping the plurality of touchelectrodes, and a low-reflection layer disposed on the light-blockingstack.

In addition, the touch display device according to the presentdisclosure further includes red, green, and blue color filtersoverlapping the light-emitting element.

The at least two light-blocking color layers realize different colorsfrom each other.

Specifically, a first embodiment of the at least two light-blockingcolor layers include a first light-blocking color layer formed of thesame or substantially the same material as one of the red and greencolor filters, and a second light-blocking color layer disposed on thefirst light-blocking color layer and formed of the same or substantiallythe same material as the blue color filter.

A second embodiment of the at least two light-blocking color layersinclude a first light-blocking color layer formed of the same orsubstantially the same material as the red color filter, a secondlight-blocking color layer formed of the same or substantially the samematerial as the green color filter, and a third light-blocking colorlayer formed of the same or substantially the same material as the bluecolor filter.

The low-reflection layer is formed in a single-layered or multi-layeredstructure using at least one of TiO_(x), CuN_(x), CuMg, CuS, AlON,AlTiN, MoTaO_(x), or MoTiON.

In addition, the touch display device further includes a routing lineconnected to the touch electrodes and disposed along the side surface ofthe encapsulation unit, and a touch pad connected to the routing line.

In addition, the touch display device further includes a touchprotective film disposed on the low-reflection layer and on thesubstrate in a region other than the region where the touch pad islocated. For example, a touch protective film is on the low-reflectionlayer and on the substrate in a region spaced apart from the touch pad.

At least one of the light-blocking stack or the low-reflection layeroverlaps the routing line.

As is apparent from the above description, in a touch display deviceaccording to the present disclosure, a light-blocking stack composed ofat least two light-blocking color layers realizing different colors fromeach other and a low-reflection layer disposed on the light-blockingstack are formed so as to overlap at least one of a touch electrodeformed of opaque metal, a bridge, or a routing line. Accordingly, it ispossible to prevent external light from being reflected by the touchelectrode, the bridge, and the routing line, and thus the presentdisclosure is capable of exhibiting low reflectivity.

In addition, the touch display device according to the presentdisclosure is capable of exhibiting low reflectivity without a separatepolarizing plate, thereby reducing manufacturing costs and preventing areduction in transmissivity.

It will be apparent to those skilled in the art that variousmodifications and variations can be made in the present disclosurewithout departing from the spirit or scope of the disclosure. Thus, itis intended that the present disclosure covers the modifications andvariations of this disclosure provided they come within the scope of theappended claims and their equivalents.

The various embodiments described above can be combined to providefurther embodiments. These and other changes can be made to theembodiments in light of the above-detailed description. In general, inthe following claims, the terms used should not be construed to limitthe claims to the specific embodiments disclosed in the specificationand the claims, but should be construed to include all possibleembodiments along with the full scope of equivalents to which suchclaims are entitled. Accordingly, the claims are not limited by thedisclosure.

What is claimed is:
 1. A touch display device, comprising: a substrate;a light-emitting element on the substrate; an encapsulation unit on thelight-emitting element; a plurality of touch electrodes on theencapsulation unit; a light-blocking stack disposed on the plurality oftouch electrodes and stacked with at least two light-blocking colorlayers; and a low-reflection layer on the light-blocking stack.
 2. Thetouch display device according to claim 1, wherein the at least twolight-blocking color layers realize different colors from each other. 3.The touch display device according to claim 1, further comprising: red,green, and blue color filters overlapping the light-emitting element,wherein the at least two light-blocking color layers include: a firstlight-blocking color layer formed of either a same or substantially thesame material as one of the red and green color filters; and a secondlight-blocking color layer on the first light-blocking color layer andformed of either a same or substantially the same material as the bluecolor filter.
 4. The touch display device according to claim 1, furthercomprising: red, green, and blue color filters overlapping thelight-emitting element, wherein the at least two light-blocking colorlayers include: a first light-blocking color layer formed of either asame or substantially the same material as the red color filter; asecond light-blocking color layer formed of either a same orsubstantially the same material as the green color filter; and a thirdlight-blocking color layer formed of either a same or substantially thesame material as the blue color filter.
 5. The touch display deviceaccording to claim 1, wherein the low-reflection layer is formed ineither a single-layered or multi-layered structure using at least one ofTiO_(x), CuN_(x), CuMg, CuS, AlON, AlTiN, MoTaO_(x), or MoTiON.
 6. Thetouch display device according to claim 1, further comprising: a routingline electrically connected to the touch electrodes and disposed along aside surface of the encapsulation unit; and a touch pad electricallyconnected to the routing line.
 7. The touch display device according toclaim 6, further comprising: a touch protective film on thelow-reflection layer and on the substrate in a region spaced apart fromthe touch pad.
 8. The touch display device according to claim 6, whereinat least one of the light-blocking stack or the low-reflection layeroverlaps the routing line.
 9. The touch display device according toclaim 6, wherein the encapsulation unit includes a plurality ofinorganic encapsulation layers and at least one organic encapsulationlayer.
 10. The touch display device according to claim 9, wherein atleast one of the plurality of inorganic encapsulation layers extendsmore toward the touch pad than the at least one organic encapsulationlayer.
 11. The touch display device according to claim 1, furthercomprising: a bank disposed under the encapsulation unit, wherein thelow-reflection layer overlaps with the bank.
 12. The touch displaydevice according to claim 1, further comprising: a touch planarizationlayer disposed between the touch electrode and the light-blocking stackand disposed on the substrate in a region spaced apart from the touchpad.
 13. The touch display device according to claim 1, wherein thelow-reflection layer is formed of a low-reflection material havingreflectivity having a single-digit percentage (%).